> You can easily write a script that monitors the exit status of
> mii-diag --status eth0
> or the output of
> mii-diag --watch eth0
>>http://www.scyld.com/diag/index.html
On this page, in the Network section, is an example of such a script:
http://www.tc.umn.edu/~hick0088/laptop/i4100.html
In this case it's a clever laptop hack that starts your dhcp client
whenever the link comes up. For non-laptops, most ethernet drivers
print something in /var/log/messages and/or dmesg when the link
comes up, so you can just look at your cluster logs and see if
your switch or cables are being flakey over the long run.
-- greg
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